secondary google calendars do not sync

I have a few secondary or sub-calendars in my google calendar. When I open the "google sync" option settings, I see and enable these calendars available for options to sync. During sync process, google sync also shows that it's importing each calendar and no finishing error.

However, none of the appointments from the sub-calendars were sync'd over to my bb (both recurring and non-recurring appointments). Only my main calendar is sync'd.